plural of outfall

(transitive, obsolete) To burst forth, as upon an enemy; make a sally.

(obsolete) A sudden eruption of troops from a fortified place; sally. / (dialectal) A quarrel; a falling out. / The point or place of discharge of a river, drain, culvert, sewer, etc.; mouth; embouchure.

present participle of outfall

plural of flapped outfall

An outfall fitted with a metal flap so that floodwater will not back up